"The data's all there it's just that it's in a number of pots so there's registries and this is not working so we've changed it."

Assistant Commissioner Moloney said the review had not looked at how many applications for rewards had been rejected because of the amount of time it would take to sift through archives.

"We are not doing a review to go back and delve in that deep. We are getting our business right in regards to administrative process. The benefit of rewards I'll defend in any forum. I know the business, I know the advantages and I know what is gained from it," he said.

The review found:

- 51 rewards had been posted in the past decade totaling $14.9 million;

- Of these 15 cases have now been solved;

- A reward of $12,500 was paid to four applicants in relation to one solved case;

- 36 cases remain unsolved with $11.9 million on offer for help to solve the crimes.

The number of current rewards was boosted to 37 today with $100,000 posted to help find the person who landed a killer punch on 22-year-old Shannon McCormack outside the QBH nightclub in 2007.

Assistant Commissioner Moloney said Victoria Police was considering setting up a webpage similar to a "most wanted" site, which would give the public access to police rewards on offer and allow people to provide information online.

A campaign by victims of crime in NSW led to a searchable webpage of rewards being added to the main police website last year.

The NSW rewards webpage has received nearly 10,500 hits since October.

NSW Police Minister Tony Kelly said the website reminded the public of unsolved cases in which the smallest piece of information could lead to a breakthrough.

"If this website can help to solve just one case, then it will have all been worthwhile," Mr Kelly said.

Assistant Commissioner Moloney said he was seeking advice on any legal and privacy ramifications arising from a possible website.

Despite only one case resulting in a payment in 10 years, Assistant Commissioner Moloney said rewards were effective.

"There is so much more to the value of this investigative tool that is not tangible. It's the information that came to us in little pieces and bits that didn't result in a person making a claim because they had 40 other motives," he said.

"It brought the spotlight, the community spotlight back on to that day, that time and that serious incident."

He said while money had not been paid out, rewards may have prompted people to come forward including criminals looking for indemnity.

"Out of the 51 that we've gone with in the last 10 years, 15 are now solved. If you work that out that's 31% hit rate," he said.

"Now I'm not claiming that they're all related to the rewards, not in a million years ... people don't pick up that phone for money it could be a partner, it could be a business partner, it could be part of a criminal group that have fallen out now ... there are so many motives that drive a person to pick up that phone and tell police what they know."

Assistant Commissioner Moloney said rewards showed victims, their families and the wider community that cases had not been forgotten.

"This is to show ... the community, number one we're still diligently pursuing people responsible for the most serious crimes in this state," he said.

"There's no way having dealt with victim crime all my life there is no way I could ever go to a family and say `The murder of your brother, father, child, daughter is closed because it's not, because we've learnt over 150 years of policing that nothing's impossible."